GDS elements always consist of a substring in which an abbreviation or acronym in capital letters is followed by a = (equal sign), which is followed by a string value. As you will learn in more detail in Programming in the CDS Namespace, these substrings represent pairs of attribute types and attribute values.
For example, consider the following global DCE name:
/.../C=DE/O=SNI/OU=DCE/subsys/druecker/docs
In it, the attribute=value form of the leftmost elements after the /... indicates that the global part of the name is a GDS namespace entry, and that it ends after the OU=DCE element; therefore, the rest of the name is in the /.../C=DE/O=SNI/OU=DCE cell.